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Quad-Channel DDR4 ECC Memory Support
With the most memory channels you can get on desktop, the Ryzen™ Threadripper™ processor can support Workstation Standard DDR4 ECC (Error Correcting Mode) Memory to keep you tight, tuned and perfectly in sync.

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If that's true, it sounds like the X399 board ECC support has improved considerably. As the links I posted illustrate, ECC support on X399 boards was at one time, spotty and inconsistent, leading to plenty of consumer confusion. Whether through firmware updates, or just better vendor support, it sounds like over time the situation has improved.

Consumer boards routinely ship with immature board firmware, this is normal. All board that do support ECC did advertise ECC support in their specs though.

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if only that were AM4.... I have an old X99 that spews AER errors like a mad dog, can't wait till a consumer AMD processor can handle 7 slots at least PCIEx8 in length each

Well, that's asking for quite a lot if you want something as cheap as a typical AM4 platform. You'll need to spend at least $800 on the CPU and motherboard alone. What exactly do you need so many slots with so many lanes for? That's typically server-grade stuff right there.

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It may look good on paper but ASRock? No thanks. Too many boards that promise a lot and end up either being not fully functional or buggy as hell. Then in short order stop making BIOS updates leaving the thing to rot. Many defunct motherboard manufacturers operated this way and they eventually folded because of it.

My primary criteria when looking at board makers is to simply look at how long they continue to support the board with updates over time. Some manufacturers simply crank out a board then abandon it for the next one. These seem like poorly run companies and a recipe for disaster.

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It may look good on paper but ASRock? No thanks. Too many boards that promise a lot and end up either being not fully functional or buggy as hell. Then in short order stop making BIOS updates leaving the thing to rot. Many defunct motherboard manufacturers operated this way and they eventually folded because of it.

My primary criteria when looking at board makers is to simply look at how long they continue to support the board with updates over time. Some manufacturers simply crank out a board then abandon it for the next one. These seem like poorly run companies and a recipe for disaster.

I've no experience with ASrock, but I agree with your general sentiment. IMO this problem is more prevalent on the consumer peecee side than on the server boards. I went through several craptastic uber-buggy VIA chipset boards in the 90's and early 2000's.

My go-to board vendor these days is Supermicro, as they seem to make a solid product and will still release BIOS updates years later. I have a bunch of H8SCM Opteron boards from them, circa 2011, and they most recently shipped a new BIOS in 2016 - a full five years later.